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Preoperative thyroid function and weight loss after bariatric surgery.

João Sérgio Neves1,2, Pedro Souteiro3,4, Sofia Castro Oliveira3,4

  • 1Department of Endocrinology, Diabetes and Metabolism, Centro Hospitalar São João, Porto, Portugal. joaosergioneves@gmail.com.

International Journal of Obesity (2005)
|May 18, 2018
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Summary
This summary is machine-generated.

High free triiodothyronine (FT3) levels before bariatric surgery are linked to greater excess weight loss. This finding suggests thyroid function may influence weight loss outcomes and offers potential therapeutic targets for obesity treatment.

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Area of Science:

  • Endocrinology
  • Bariatric Surgery
  • Metabolic Regulation

Background:

  • Thyroid function significantly influences body weight regulation.
  • The specific impact of preoperative thyroid function on post-bariatric surgery weight loss remains largely uncharacterized.

Purpose of the Study:

  • To investigate the association between preoperative thyroid function parameters and excess weight loss one year after bariatric surgery.
  • To identify potential thyroid-related predictors of successful weight loss in morbidly obese patients.

Main Methods:

  • Prospective evaluation of 641 morbidly obese patients undergoing bariatric surgery.
  • Exclusion of patients with pre-existing thyroid disease or overt thyroid dysfunction.
  • Analysis of preoperative thyroid-stimulating hormone (TSH), free thyroxine (FT4), and free triiodothyronine (FT3) levels in relation to excess weight loss.

Main Results:

  • Preoperative TSH and FT4 levels showed no association with weight loss outcomes.
  • Variations in FT3 within the normal reference range did not correlate with weight loss.
  • Patients with elevated preoperative FT3 levels (above the reference range) exhibited significantly greater excess weight loss compared to those with normal FT3.
  • This association remained significant after adjusting for confounding factors like age, sex, BMI, and surgical procedure.

Conclusions:

  • Elevated preoperative free triiodothyronine (FT3) is associated with enhanced weight loss following bariatric surgery.
  • These findings suggest that thyroid function, particularly FT3 levels, may play a crucial role in determining bariatric surgery success.
  • Modulating thyroid function could represent a novel therapeutic strategy to improve weight loss outcomes in bariatric surgery patients.